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DUAL 1-OF-4 DECODER/ DEMULTIPLEXER
The S N54 / 74LS155 and SN54 / 74LS156 are hi gh speed Dual 1-of-4 Decoder/Demultiple xers. These devices have two decoders w ith common 2-bit Address inputs and sep arate gated Enable inputs. Decoder “a ” has an Enable gate with one active HIGH and one active LOW input. Decoder “b” has two active LOW Enable input s. If the Enable functions are satisfie d, one output of each decoder will be L OW as selected by the address inputs. T he LS156 has open collector outputs for wired-OR (DOT-AND) decoding and functi on generator applications. The LS155 an d LS156 are fabricated with the Schottk y barrier diode process for high speed and are completely compatible with all Motorola TTL families.
SN54/74LS155 SN 54/74LS156
DUAL 1-OF-4 DECODER / DEMUL TIPLEXER
LS156-OPEN-COLLECTOR LOW POWER SCHOTTKY
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Sch ottky Process for High Speed Multifunct ion Capability Common Address Inputs Tr ue or Complement Data Demultiplexing Input Clamp Diodes Limit High Speed Terminatio